Preparation of CexZr1−xO2 (x=0.75, 0.62) solid solution and its application in Pd-only three-way catalysts

Guo, Yun; Lu, Guanzhong; Zhang, Zhigang; Zhang, Shunhai; Yan, Qi; Liu, Yi

doi:10.1016/j.cattod.2007.06.033

Cited by 89 publications

(37 citation statements)

References 36 publications

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“…The samples Ce x La 1-x O 2 (x = 0.8, 0.6, 0.5) only show one broad reduction peak in the temperature range 450-650°C. The surface and bulk reduction was not distinguished clearly [29]. In comparison with the peak (805°C) of pure CeO 2 , the reduction peaks of the Ce x La 1-x O 2 samples shift to much lower temperature.…”

Section: Resultsmentioning

confidence: 57%

Catalytic combustion of toluene on Pd/Ce x La1−x O2/monolith catalysts

Yue

et al. 2011

Reac Kinet Mech Cat

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The heterogeneous catalytic oxidation of volatile organic compounds on Pd/Ce x La 1-x O 2 /monolith catalysts in the temperature range 160-230°C has been studied, which took toluene combustion as a probe reaction. SEM, ICP-OES, XRD, laser Raman spectra, and temperature-programmed reduction (TPR) are used to characterize the Pd/Ce x La 1-x O 2 /monolith catalysts. A high activity of the catalyst with respect to the complete oxidation of toluene to carbon dioxide has been observed. The conversion of toluene approaches 100% at about 210°C.

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Section: Resultsmentioning

confidence: 57%

Catalytic combustion of toluene on Pd/Ce x La1−x O2/monolith catalysts

Yue

et al. 2011

Reac Kinet Mech Cat

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“…However, CeO 2 would be sintered after calcination at 750°C [7]; replacing some Ce atoms in its crystal lattice by other cations (such as Zr) would lead to the microstain and yield a better thermal stability as well as higher oxygen exchanging ability. Recently, a new generation of mixed oxides based on CeO 2 and ZrO 2 has been developed [8,9]. As these catalysts can exchange oxygen with reactants and this is somewhat important for the redox reactions, their oxygen storage capacity will be an important factor in exploring its catalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Selective catalytic reduction of NO with CO on Pt/W–Ce–Zr catalysts

Zhu

Kim

Ihm

2009

React Kinet Catal Lett

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Various Pt catalysts (Pt/ZrO 2 , Pt/CeO 2 , Pt/CeZrO, Pt/WO 3 /ZrO 2 and Pt/WO 3 /CeZrO) were prepared and characterized, and their catalytic reduction reactions of NO by CO, with or without the presence of excess oxygen, were investigated. The results of temperature-programmed experiments showed that CO could be easily oxidized over Pt/CeO 2 and Pt/CeZrO while the introduction of WO 3 into the catalyst (Pt/WO 3 /CeZrO) inhibited the reduction of catalyst surface; NO could not dissociate over those catalysts in oxidized state but after CO reduction at a low temperature, NO dissociation took place only over Pt/CeO 2 and Pt/CeZrO catalysts. For NO ? CO reaction, those easily reduced catalysts Pt/CeO 2 and Pt/ CeZrO exhibited better catalytic performances, and NO could be rapidly converted below 350°C. For the reaction with the presence of excess O 2 , the NO conversions were significantly inhibited, but better NO conversions were obtained over the tungstate-contained catalysts when compared with Pt/CeO 2 and Pt/CeZrO. The higher activities of Pt/W-Ce-Zr catalysts were attributed to their high acidities.

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“…The actual position of the main ceria band is in fact lower than -1 for all Ce0.64Zr0.27Nd0.09O δ catalysts, which is the typical value for plane ceria. Therefore, the position of the main ceria band in the Raman spectra (see the detail of this band in Figure 6) suggests that the effect of Nd respectively [38,39], and therefore, cerium and neodymium cations are expected to coprecipitate more homogeneously than zirconium cations, whose solubility is much lower.…”

Section: Analysis Of Zr and Nd Doping Into The Ceria Lattice By Ramanmentioning

confidence: 99%

Effect of the CeZrNd mixed oxide synthesis method in the catalytic combustion of soot

2015

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Ce0.64Zr0.27Nd0.09O δ mixed oxides have been prepared by three different methods (nitrates calcination, coprecipitation and microemulsion), characterized by N2 adsortion, XRD, H2-TPR, Raman spectroscopy and XPS, and tested for soot combustion in NOx/O2. The catalyst prepared by microemulsion method is the most active one, which is related to its high surface area (147 m 2 /g) and low crystallite size (6 nm), and the lowest activity was obtained with the catalyst prepared by coprecipitation (74 m 2 /g; 9 nm). The catalyst prepared by nitrates precursors calcination is slightly less active to that prepared by microemulsion but the synthesis procedure is very straightforward and surfactants or other chemicals are not required, being very convenient for scaling up and practical utilization. The high activity of the catalyst prepared by nitrates calcination can be attributed to the better introduction of Nd cations into the parent ceria framework than on catalysts prepared by coprecipitaion and microemulsion, which promotes the creation of more oxygen vacancies.

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Preparation of CexZr1−xO2 (x=0.75, 0.62) solid solution and its application in Pd-only three-way catalysts

Cited by 89 publications

References 36 publications

Catalytic combustion of toluene on Pd/Ce x La1−x O2/monolith catalysts

Catalytic combustion of toluene on Pd/Ce x La1−x O2/monolith catalysts

Selective catalytic reduction of NO with CO on Pt/W–Ce–Zr catalysts

Effect of the CeZrNd mixed oxide synthesis method in the catalytic combustion of soot

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